No. 4.] U. S. DEPARTMENT OF AGRICULTURE. 185 



included the milk of 56 tuberculous cows. A synopsis of 

 the results shows that one or more of the guinea pigs fed 

 on the milk from eacli cow succumbed to tul)erculosis. 

 Owing to the greater percentage of positive results obtained, 

 it appears probable that the virulence of the milk increased 

 with the advancement of the disease in the cow. The com- 

 bined results of the experiments show that the milk of 12 

 out of 56 cows, or 21.4 per cent, has at one time or another 

 since the beginning of the experiment- contained tubercle 

 bacilli. 



The demand for blackleg vaccine, manufactured by the 

 Bureau, is gradually increasing as this method of preventive 

 treatment becomes better known and its merits more widely 

 heralded. In the last year 1,688,885 doses of vaccine were 

 distributed throughout the United States, and 565,628 cattle 

 were vaccinated, of which number 2,902 died after vaccina- 

 tion, a little more than one-half of 1 per cent. If we elim- 

 inate the number of animals that were probably infected 

 before they were vaccinated, and which died after the injec- 

 tion, also the number of deaths which were acknowledsfed 

 by the stock owners to be the result of their own mistakes, 

 the number of cows that died after vaccination is reduced to 

 2,538, or .44 per cent. 



An important branch of the Bureau of Animal Industry 

 is the dairy division. A general survey of the conditions 

 of the dairy industr}" of the country was begun when the 

 division was organized, and special inquiries have been 

 made, looking to the development of foreign markets for 

 the dairy products of this country. 



Special agents have been sent to Japan, China and the 

 Philippines, for the purpose of investigating the market 

 conditions and arranging for a scries of experimental exports 

 of dairy products from this country. Other agents have 

 been sent to Canada, Belgium and Holland. Exports of 

 dair}^ products have been made to Japan, Cuba and Porto 

 Rico. This method of making known the better grade of 

 these products has resulted in increased sales by merchants 

 In San Francisco and New York. 



Inquiries by correspondence indicate that there are good 



